In my experience with Starbucks, the number of pumps for white chocolate syrup in a beverage can vary based on the size of the drink. For a standard-sized drink, like a tall, there are typically three pumps of white chocolate syrup. However, for larger sizes like grande or venti, they may use more pumps to maintain the flavor balance. It’s always a good idea to specify your preference when ordering, as Starbucks allows some customization. So, for the best taste that suits your liking, don’t hesitate to communicate the number of pumps you prefer with your barista.